Radical external beam radiotherapy for clinically localized prostate cancer in Japan: Changing trends in the patterns of care process survey between 1996-1998 and 1999-2001

Kazuhiko Ogawa, Katsumasa Nakamura, Hiroshi Onishi, Tomonari Sasaki, Masahiko Koizumi, Yoshiyuki Shioyama, Takafumi Komiyama, Yuuki Miyabe, Teruki Teshima

Research output: Contribution to journalReview article

11 Citations (Scopus)

Abstract

Background: This report presents results of a study delineating changing trends in radical external beam radiotherapy usage for prostate cancer between the 1996-1998 and 1999-2001 Patterns of Care Study (PCS) survey periods in Japan. Materials and Methods: Out of the 694 patients comprising the 1996-1998 and 1999-2001 PCS surveys, the current study analyzed data for 444 patients with clinically localized prostate cancer treated with external beam radiotherapy (1996-1998 PCS: 161 patients; 1999-2001 PCS: 283 patients). Results: Significantly higher percentages of patients had earlier T stages (T1-T2: 48.2%) and well-differentiated tumors (23.6%) between 1999 and 2001 than between 1996 and 1998 (T1-T2: 34.6%, well-differentiated tumors: 15.1%). Although only 5.9% of patients were treated with radiotherapy by their own choice during 1996-1998, a larger proportion (26.5%) chose this treatment during 1999-2001. The median radiation dose was 65.0 Gy during 1996-1998, increasing to 68.4 Gy during 1999-2001. Moreover, the incidence of total treatment doses of ≥70 Gy was higher during 1999-2001 (38.0%) than during 1996-1998 (17.5%). On the other hand, the percentage of patients receiving conformal therapy during 1996-1998 (49.1%) was almost the same as during 1999-2001 (50.2%). The median numbers of full-time equivalent (FTE) radiation oncologists increased in academic institutions (1.8 in 1996-1998; 2.4 in 1999-2001), while those in non-academic institutions remained low (0.5 in 1996-1998; 0.45 in 1999-2001). Conclusion: In Japan, fewer prostate cancer patients treated with radical external beam radiotherapy had advanced diseases. Increasing percentages of patients chose radiotherapy and received increased radiation doses, which might reflect the growing acceptance of radical external beam radiotherapy as a first-line treatment for prostate cancer in Japan.

Original languageEnglish
Pages (from-to)3507-3511
Number of pages5
JournalAnticancer research
Volume25
Issue number5
Publication statusPublished - Sep 1 2005

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Prostatic Neoplasms
Japan
Radiotherapy
Radiation
Surveys and Questionnaires
Therapeutics
Neoplasms
Incidence

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

Cite this

Radical external beam radiotherapy for clinically localized prostate cancer in Japan : Changing trends in the patterns of care process survey between 1996-1998 and 1999-2001. / Ogawa, Kazuhiko; Nakamura, Katsumasa; Onishi, Hiroshi; Sasaki, Tomonari; Koizumi, Masahiko; Shioyama, Yoshiyuki; Komiyama, Takafumi; Miyabe, Yuuki; Teshima, Teruki.

In: Anticancer research, Vol. 25, No. 5, 01.09.2005, p. 3507-3511.

Research output: Contribution to journalReview article

Ogawa, Kazuhiko ; Nakamura, Katsumasa ; Onishi, Hiroshi ; Sasaki, Tomonari ; Koizumi, Masahiko ; Shioyama, Yoshiyuki ; Komiyama, Takafumi ; Miyabe, Yuuki ; Teshima, Teruki. / Radical external beam radiotherapy for clinically localized prostate cancer in Japan : Changing trends in the patterns of care process survey between 1996-1998 and 1999-2001. In: Anticancer research. 2005 ; Vol. 25, No. 5. pp. 3507-3511.
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title = "Radical external beam radiotherapy for clinically localized prostate cancer in Japan: Changing trends in the patterns of care process survey between 1996-1998 and 1999-2001",
abstract = "Background: This report presents results of a study delineating changing trends in radical external beam radiotherapy usage for prostate cancer between the 1996-1998 and 1999-2001 Patterns of Care Study (PCS) survey periods in Japan. Materials and Methods: Out of the 694 patients comprising the 1996-1998 and 1999-2001 PCS surveys, the current study analyzed data for 444 patients with clinically localized prostate cancer treated with external beam radiotherapy (1996-1998 PCS: 161 patients; 1999-2001 PCS: 283 patients). Results: Significantly higher percentages of patients had earlier T stages (T1-T2: 48.2{\%}) and well-differentiated tumors (23.6{\%}) between 1999 and 2001 than between 1996 and 1998 (T1-T2: 34.6{\%}, well-differentiated tumors: 15.1{\%}). Although only 5.9{\%} of patients were treated with radiotherapy by their own choice during 1996-1998, a larger proportion (26.5{\%}) chose this treatment during 1999-2001. The median radiation dose was 65.0 Gy during 1996-1998, increasing to 68.4 Gy during 1999-2001. Moreover, the incidence of total treatment doses of ≥70 Gy was higher during 1999-2001 (38.0{\%}) than during 1996-1998 (17.5{\%}). On the other hand, the percentage of patients receiving conformal therapy during 1996-1998 (49.1{\%}) was almost the same as during 1999-2001 (50.2{\%}). The median numbers of full-time equivalent (FTE) radiation oncologists increased in academic institutions (1.8 in 1996-1998; 2.4 in 1999-2001), while those in non-academic institutions remained low (0.5 in 1996-1998; 0.45 in 1999-2001). Conclusion: In Japan, fewer prostate cancer patients treated with radical external beam radiotherapy had advanced diseases. Increasing percentages of patients chose radiotherapy and received increased radiation doses, which might reflect the growing acceptance of radical external beam radiotherapy as a first-line treatment for prostate cancer in Japan.",
author = "Kazuhiko Ogawa and Katsumasa Nakamura and Hiroshi Onishi and Tomonari Sasaki and Masahiko Koizumi and Yoshiyuki Shioyama and Takafumi Komiyama and Yuuki Miyabe and Teruki Teshima",
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T1 - Radical external beam radiotherapy for clinically localized prostate cancer in Japan

T2 - Changing trends in the patterns of care process survey between 1996-1998 and 1999-2001

AU - Ogawa, Kazuhiko

AU - Nakamura, Katsumasa

AU - Onishi, Hiroshi

AU - Sasaki, Tomonari

AU - Koizumi, Masahiko

AU - Shioyama, Yoshiyuki

AU - Komiyama, Takafumi

AU - Miyabe, Yuuki

AU - Teshima, Teruki

PY - 2005/9/1

Y1 - 2005/9/1

N2 - Background: This report presents results of a study delineating changing trends in radical external beam radiotherapy usage for prostate cancer between the 1996-1998 and 1999-2001 Patterns of Care Study (PCS) survey periods in Japan. Materials and Methods: Out of the 694 patients comprising the 1996-1998 and 1999-2001 PCS surveys, the current study analyzed data for 444 patients with clinically localized prostate cancer treated with external beam radiotherapy (1996-1998 PCS: 161 patients; 1999-2001 PCS: 283 patients). Results: Significantly higher percentages of patients had earlier T stages (T1-T2: 48.2%) and well-differentiated tumors (23.6%) between 1999 and 2001 than between 1996 and 1998 (T1-T2: 34.6%, well-differentiated tumors: 15.1%). Although only 5.9% of patients were treated with radiotherapy by their own choice during 1996-1998, a larger proportion (26.5%) chose this treatment during 1999-2001. The median radiation dose was 65.0 Gy during 1996-1998, increasing to 68.4 Gy during 1999-2001. Moreover, the incidence of total treatment doses of ≥70 Gy was higher during 1999-2001 (38.0%) than during 1996-1998 (17.5%). On the other hand, the percentage of patients receiving conformal therapy during 1996-1998 (49.1%) was almost the same as during 1999-2001 (50.2%). The median numbers of full-time equivalent (FTE) radiation oncologists increased in academic institutions (1.8 in 1996-1998; 2.4 in 1999-2001), while those in non-academic institutions remained low (0.5 in 1996-1998; 0.45 in 1999-2001). Conclusion: In Japan, fewer prostate cancer patients treated with radical external beam radiotherapy had advanced diseases. Increasing percentages of patients chose radiotherapy and received increased radiation doses, which might reflect the growing acceptance of radical external beam radiotherapy as a first-line treatment for prostate cancer in Japan.

AB - Background: This report presents results of a study delineating changing trends in radical external beam radiotherapy usage for prostate cancer between the 1996-1998 and 1999-2001 Patterns of Care Study (PCS) survey periods in Japan. Materials and Methods: Out of the 694 patients comprising the 1996-1998 and 1999-2001 PCS surveys, the current study analyzed data for 444 patients with clinically localized prostate cancer treated with external beam radiotherapy (1996-1998 PCS: 161 patients; 1999-2001 PCS: 283 patients). Results: Significantly higher percentages of patients had earlier T stages (T1-T2: 48.2%) and well-differentiated tumors (23.6%) between 1999 and 2001 than between 1996 and 1998 (T1-T2: 34.6%, well-differentiated tumors: 15.1%). Although only 5.9% of patients were treated with radiotherapy by their own choice during 1996-1998, a larger proportion (26.5%) chose this treatment during 1999-2001. The median radiation dose was 65.0 Gy during 1996-1998, increasing to 68.4 Gy during 1999-2001. Moreover, the incidence of total treatment doses of ≥70 Gy was higher during 1999-2001 (38.0%) than during 1996-1998 (17.5%). On the other hand, the percentage of patients receiving conformal therapy during 1996-1998 (49.1%) was almost the same as during 1999-2001 (50.2%). The median numbers of full-time equivalent (FTE) radiation oncologists increased in academic institutions (1.8 in 1996-1998; 2.4 in 1999-2001), while those in non-academic institutions remained low (0.5 in 1996-1998; 0.45 in 1999-2001). Conclusion: In Japan, fewer prostate cancer patients treated with radical external beam radiotherapy had advanced diseases. Increasing percentages of patients chose radiotherapy and received increased radiation doses, which might reflect the growing acceptance of radical external beam radiotherapy as a first-line treatment for prostate cancer in Japan.

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